GSS7Can you answer these queries VII 给出一棵树,树的节点有权值,有两种操作: 1.询问节点x,y的路径上最大子段和,可以为空 2.把节点x,y的路径上所有节点的权值置为c 分析: 修改树路径的信息,可以考虑一下树链剖分.动态树. 这题可以用树链剖分的方式来做,不会的可以看看这篇 树链剖分---模板.其实树链剖分不难理解,一小时左右就能学会了. 对于在一段区间的最大子段和问题,可以参考GSS1 spoj 1043 Can you answer these qu…
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A+B for Input-Output Practice (VII) Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 62483 Accepted Submission(s): 41718 Problem Description Your task is to Calculate a + b. Input The input…
汉诺塔VII Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 1503 Accepted Submission(s): 1077 Problem Description n个盘子的汉诺塔问题的最少移动次数是2^n-1,即在移动过程中会产生2^n个系列.由于发生错移产生的系列就增加了,这种错误是放错了柱子,并不会把大盘放到小盘上,即各柱子从…
A+B for Input-Output Practice (VII) Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) Problem Description Your task is to Calculate a + b. Input The input will consist of a series of pairs of integers a and b, separated…